Valve



Reb. 5, 194e.

L.. C. ROTTER ET AL VALVE Original Filed Oct. 5, 1942 mi `S mm RQ MS mmQ HW M Uw@ Patented Feb. 5, 1946 VALVE Lutwln C. Retter, Maplewood, andVictor G.

Klein, St. Louis, Mo., assignors to Lincoln Ensineering Company, St.Louis, Mo., a corporation of Missouri Original application October 5,-1942, Serial No.`

Divided and this application August s, 1944, serial No. 548,256 comms.(ci. 277-46) 'I'his invention relates to valves, and with regard tocertain more speciilc features, to valves for use with apparatus such asshown in our United States'patent application Serial No. 460,- 790,illed October 5, 1942, for Pump. The present invention is a division oithe invention speciiled in said application.

Among the several objects of the invention may be 'noted the provisionof a double-ported valve with means for alternately opening each of saidports and exhausting through the other; the provision ol.' a valve ofthe class described adapted to throttle one of the exhaust ports so asto limit to a predetermined amount pressure that will be' exhaustedthereby; the provision of a valve of the class described in which saidpressure limitation is coniined to one port; and the provision of avalve of this class which is simple in construction and foolproof inoperation. Other objects will be in part obvious and in part pointed outhereinafter.

The invention accordingly comprises the elements and combinations ofelements, features of construction, and arrangements of parts which willbe exemplified in the structures hereinafter described, and the scope ofthe application of which will be indicated in the following claims.

In the accompanying drawing, in which is illustrated one of variouspossible embodiments of the invention,

Fig. 1 is a vertical section of a control valve embodying the inventionand shown in mid position;

Fig. 2 is a view similar to Fig. 1, showing the valve in a position toeffect a throttle exhaust and to build up back pressure; and,

Fig. 3 is a view similar to Fig. 1, but showing said valve in anotherposition.

Similar reference characters indicate correspending parts throughout theseveral views of the drawings.

As illustrated in the parent application, it is sometimes desirable, bymeans of a single valve,

alternately to admit air to opposite sides of an operating piston whileat the same time exhausting air from the side to which air is admitted.The present valve supplies means for maintaining an exhaust backpressure on one side of the piston which is different from the exhaustback pressure on the other side.

Referring now more particularly to the drawing, the valve is showngenerally by numeral 3l. It consists in a body portion 9| bored out toreceive a slidevalve 33, the latter being grooved as shown at 93 fordetent cooperation with a springbiased ball 91. When the ball 91 is inthe groove as indicated at Fig. 1, the valve is in mid position.

The stem 93 is cylindric except where ilat as indicated at 99 forcooperation with sealing washers IUI in cups |03 forming parts ofnipples |05." Springs I 01 in the cups |05 normally bias the washers IUIinto sealing engagement with the flats 99 respectively. The lengths ofthe flats 39 are such as to permit desired movement of the valveA onboth sides of mid position.

Stem 93 is ported as indicated at |03 and lll,l

so that when the stem is in mid position (Fig. l) neither port transmitsair. When the stem 33 is down, (Fig. 2) the port Hl admits air betweenpipes 33 and 21.

When the stem 93 is up (Fig. 3), the port |09 connects pipes 31 and 29.Also, when one set of pipes 33, 21 or 31, 29 is connected the other isdisconnected from the air pressure supply.

In addition, when the stem 93 is up (Fig. 3), the pipe 21 may exhaustvia a groove H3, port IH and an exhaust H5. When the valve is down (Fig.2), the pipe 29 may exhaust through a port H1.and a throttle valve H8which is held to a 25 seat in the port in by a spring m, reacting from ahollow plug |231 Under these conditions, any exhaust from the pipe 23must be at a pressure determined by the spring I2 I.

It will be understood from the above that the pipes 33 and 31 are inletpipes for delivering air respectively to pipes 21.and 29 and that thelatter are connected to opposite sides of the controlled piston (notshown). Therefore, when the valve is in the Fig. 2 position air frompipe 33 passes to pipe 21 and hence to one side of said piston. At thattime the air on the other side of the piston is forced out through pipe23 and the port H1, supply pipe 31 being then cut oil. On the otherhand, when the valve is in the Fig.

3 position, air iiows from the supply pipe 31 t0' In view of the above,it will be seenlthat the several objects of the invention are achievedand other advantageous results attained.

As many changes could be made in the above constructions withoutdeparting from the scope of the invention, it is intended that allmatter contained in the above description or shown in ber cooperatingtherewith, a detent between the l bodyand the movable member fordetermining a neutral position from which the'movable member may move totwo operative positions, said body having two ports to be' controlledand spaced j lo apart a certain distance, said movable member having twosupply ports more closely spaced than are said body ports and adapted inopposite moved positions of the movable member alternatively to connectwith the body ports, said movable member having additional exhaust portsspaced apart more widely than the spacing of 1,

said body ports and adapted in said opposite positions of the movablemember to connect with said body ports as the supply ports in themovable member alternatively connect therewith, and a throttle reliefvalve in series with one only of said exhaust ports.

2. A valve comprisingavbodytal movable member cooperating therewith, adeteritdietween, the

ditional exhaust ports spaced apart a distance greaterA than the spacingof the body ports and adapted alternatively to connect with said'bodyports as the supply ports in the movable member alternatively connecttherewith, and a throttle relief valve in series with one only of saidexhaust ports, the other exhaust port being substantially free.

3. A valve comprising a body, a movable member cooperating therewith, adetent between the body and the movable member for determining a neutralposition from Vwhich the movable member may move to two operativepositions, said body having two ports to be controlled and spaced aparta certain distance, said movable member having two supply ports spacedapart a distance less than the distance between the body ports andadapted in alternative moved positions o! the movable memberalternatively to connect with the body ports, said movablexnemberhaving-ad A# Y ditional exhaust port portions spaced apart adistance greater than the spacing of the body ports and adaptedalternatively to connect with said body ports as the supply ports in themovable body and the movable member for deterfrng immer-alternativelyYconnecttherewith, one of a neutral position from which the movablemember may move to two operative positions, lsaid` body having two portsto be controlled and spaced apart a certain distance, said movablemember having two supply ports spaced apart a distance less than thedistance between the body ports and adapted in alternative movedpositions of the movable member alternatively to connect with the bodyports, said movable member having adsaid exhaust port portions being inthe movable member only, a throttle relief valve in said lastnamedexhaust port portion and carriedorutheg../

movable member exclusively, the other exhaust 30 port portion being inpart formed by the movable member and invpart by the body.

